There are times when you may well be faced with the need to illuminate something AND covering someone with a gun would be a no no. Perhaps your lifestyle/home set up does not offer many opportunities but there are other folks who are luckier (or unluckier I guess) than you.

I know of some folks who have had need to move through their neighborhood using a light. They didn't want to announce they were heeled so the gun was in the dominent hand with the arm alongside the body. Folks couldn't see the gun but it could be deployed much faster than from a holster. Depends.